<?php

namespace wxpay;

use think\Config;

class WxPay
{

    /**
     * @param $total_fee 订单金额
     * @param $openid    微信opneid
     * @param $order_sn  订单编号
     * @param string $body //描述
     * @return mixed
     */
    public static function pay($params){
        $order_sn=$params['orderid'];
        $param = array(
            'appid' => Config::get('site.miniappid'),//小程序id
            'body' => (string)$params['title'], //商品信息
            'mch_id'=> Config::get('site.mchid'),
            'spbill_create_ip'=>$_SERVER['REMOTE_ADDR'],//终端ip
            'notify_url'=> $params['notifyurl'], //回调通知地址
            'nonce_str'=> self::createNoncestr(),//随机字符串
//            'nonce_str'=> '123456',//随机字符串
            'out_trade_no'=>$order_sn,//商户订单编号
            'total_fee'=>$params['amount']*100, //总金额
            'openid'=>$params['openid'],//用户openid
            'trade_type'=>'JSAPI',//交易类型 小程序支付
        );

        //通过签名算法计算得出的签名值，详见签名生成算法
        $param['sign']= self::getSign($param);

        //将数组内容转为xml格式，向微信发出请求
        $xmlData = self::arrayToXml($param);
        $xml_result = self::postXmlCurl($xmlData,'https://api.mch.weixin.qq.com/pay/unifiedorder',60);
        $array = self::xmlToArray($xml_result);
//         return $array;
        if($array['return_code'] == 'SUCCESS' && $array['result_code'] == 'SUCCESS'){
            $time=time();
            $tmp = [];//临时数组用于签名
            $tmp['appId'] = $array['appid'];
            $tmp['nonceStr'] = $array['nonce_str'];
            $tmp['package'] = 'prepay_id='.$array['prepay_id'];
            $tmp['signType'] = 'MD5';
            $tmp['timeStamp'] = (string)$time;
            $result['appId'] =$array['appid'];
            $result['timeStamp'] =(string)$time;
            $result['nonceStr'] = $array['nonce_str'];//随机字符串
            $result['package'] = 'prepay_id='.$array['prepay_id'];//统一下单接口返回的 prepay_id 参数值，提交格式如：prepay_id=*
            $result['signType'] = 'MD5';//签名算法，暂支持 MD5
            $result['paySign'] = self::getSign($tmp);

            return ['code'=>1,'msg'=>'操作成功','data'=>$result];
        }else{
            //支付错误信息
            $result['return_code'] = $array['return_code'];
            $result['return_msg'] = $array['return_msg'];
            $result['err_code_des'] = $array['err_code_des'];

            return ['code'=>0,'msg'=>$array['err_code_des'],'data'=>''];
        }
        //返回签名给小程序
//        return $result;
    }
    /*
    * 对要发送到微信统一下单接口的数据进行签名
    */
    protected static function getSign($Obj){
        foreach ($Obj as $k => $v){
            $param[$k] = $v;
        }
        //签名步骤一：按字典序排序参数
        ksort($param);
        $String = self::formatBizQueryParaMap($param, false);
        //签名步骤二：在string后加入KEY
        //申请支付后有给予一个商户账号和密码，登陆后自己设置的key
        $String = $String."&key=".Config::get('site.paykey');
        //签名步骤三：MD5加密
        $String = md5($String);
        //签名步骤四：所有字符转为大写
        $result_ = strtoupper($String);
        // var_dump($result_);
        return $result_;
    }
    /*
     *排序并格式化参数方法，签名时需要使用
     */
    protected static function formatBizQueryParaMap($paraMap, $urlencode){
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v){
            if($urlencode){
                $v = urlencode($v);
            }
            //$buff .= strtolower($k) . "=" . $v . "&";
            $buff .= $k . "=" . $v . "&";
        }
        $reqPar = "";
        if (strlen($buff) > 0){
            $reqPar = substr($buff, 0, strlen($buff)-1);
        }
        return $reqPar;
    }

    /*
     * 生成随机字符串方法
     */
    protected static function createNoncestr($length = 32 ){
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str ="";
        for ( $i = 0; $i < $length; $i++ ) {
            $str.= substr($chars, mt_rand(0, strlen($chars)-1), 1);
        }
        return $str;
    }
    //数组转字符串方法
    protected static function arrayToXml($arr){
        $xml = "<xml>";
        foreach ($arr as $key=>$val)
        {
            if (is_numeric($val)){
                $xml.="<".$key.">".$val."</".$key.">";
            }else{
                $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
            }
        }
        $xml.="</xml>";
        return $xml;
    }

    //将xml字符串转换为数组
    protected static function xmlToArray($xml){
        $array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $array_data;
    }

    //发送xml请求方法
    private static function postXmlCurl($xml, $url, $second = 30) {
        $ch = curl_init();
        //设置超时
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验
        //设置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
        curl_setopt($ch, CURLOPT_TIMEOUT, 40);
        set_time_limit(0);
        //运行curl
        $data = curl_exec($ch);
        //返回结果
        if ($data) {
            curl_close($ch);
            return $data;
        }else {
            $error = curl_errno($ch);
            curl_close($ch);
            return json(['msgArr'=>"curl出错，错误码:$error"]);
        }
    }


    //充值回调
    public static function wx_notify(){
        $post = $_REQUEST;
        if ($post == null) {
            $post = file_get_contents("php://input");
        }
        if ($post == null) {
            $post = isset($GLOBALS['HTTP_RAW_POST_DATA']) ? $GLOBALS['HTTP_RAW_POST_DATA'] : '';
        }
        file_put_contents("wxback.txt",file_get_contents("php://input"));
        if (empty($post) || $post == null || $post == '') {
            //阻止微信接口反复回调接口  文档地址 https://pay.weixin.qq.com/wiki/doc/api/H5.php?chapter=9_7&index=7，下面这句非常重要!!!
            $str='<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
            echo $str;
            exit('Notify 非法回调');
        }
        libxml_disable_entity_loader(true); //禁止引用外部xml实体
        $xml = simplexml_load_string($post, 'SimpleXMLElement', LIBXML_NOCDATA);//XML转数组
        $post_data = (array)$xml;
        $wx_sign=$post_data['sign'];
        unset($post_data['sign']);
        $sign=self::getSign($post_data);//验证签名
        if ( $sign === $wx_sign) {
            //处理支付成功后逻辑
            $return = ['return_code'=>'SUCCESS','return_msg'=>'OK'];//成功
            $xml = '<xml>';
            foreach($return as $k=>$v){
                $xml.='<'.$k.'><![CDATA['.$v.']]></'.$k.'>';
            }
            $xml.='</xml>';
            echo $xml;
        }else{
            //阻止微信接口反复回调接口  文档地址 https://pay.weixin.qq.com/wiki/doc/api/H5.php?chapter=9_7&index=7，下面这句非常重要!!!
            $str='<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
            echo $str;
            exit('Notify 非法回调');
        }
    }
}